package org.shj.netty.chartper5;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

public class EchoClient {

	public void connect(int port, String host) throws Exception{
		EventLoopGroup group = new NioEventLoopGroup();
		try{
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioSocketChannel.class)
			 .option(ChannelOption.TCP_NODELAY, true)
			 .handler(new ChannelInitializer<SocketChannel>(){

				@Override
				protected void initChannel(SocketChannel channel) throws Exception {
					ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes());
					
					channel.pipeline().addLast(new DelimiterBasedFrameDecoder(1024, delimiter));
					channel.pipeline().addLast(new StringDecoder());
					channel.pipeline().addLast(new EchoClientHandler());
				}
			 });
			
			ChannelFuture f = b.connect(host, port).sync();
			
			f.channel().closeFuture().sync();
		}finally{
			group.shutdownGracefully();
		}
	}
	
	public static void main(String[] args) throws Exception{
		int port = 8080;
		
		if(args != null && args.length > 0){
			try{
				port = Integer.valueOf(args[0]);
			}catch(NumberFormatException e){
				
			}
		}
		
		new EchoClient().connect(port, "127.0.0.1");
	}
}
